Facebook gets all your Gmail contacts and send them recommendation to like the Facebook page. Before sending it, you’ll be asked to see the preview of the invitation they’ll receive. View it, and press ‘Send’. That’s all, Invitation sent!!

Previously, Facebook had a simple interface to import Gmail contacts but it was later revoked when Google prevented all external services from fetching Gmail contacts of any user. That’s why we had to go the longer way to send page recommendation to Gmail contacts.